Abstract
It is known that paving is a system with multiple layers and the strength of each layer is reflected on the entire pavement. Two kinds of materials are used as the base layer, and the materials are divided into ordinary traditional granular materials and recycled materials such as foundry sand. This paper presents the results of laboratory tests in the laboratory and discusses the effect of each of the materials and foundry sand and its effect as a stabilizer on the strength of the substrate and as a stabilizer. Also, a comparison is made between the changes that occur in the base layer Cast sand treated and compared with untreated. A mixture of foundry sand with graded natural aggregate according to certain sizes is used as a stabilizer in proportions (5, 10 and 15) %. The treated and untreated base layer is compared in terms of strength. The base layer material is a traditional base material taken from the Nabaie quarry. Samples are made of three replicates of each possible group. Samples were prepared and subjected to a compressive strength CBR test. The obtained results indicate an increase in the resistance of the base material when using FS at a rate of (5%) with a treatment period of 4 days, while a ratio of 10% gave the highest resistance in a treatment period of 14 days, and these ratios gave more resistance than the untreated samples without the additive.
Highlights
Pavement design is a procedure for determining the most cost-effective combination of layer thicknesses and material types as for the pavement, consideration must be given to the characteristics of the underlying soil, the resulting traffic that is transported during the supposed service life of the road, and the affecting climatic conditions .]1[
Roads are exposed to increasing pressure in their maintenance because they use recycled materials as alternative or secondary materials because they consume a large number of available materials in road construction
Figure (4) shows the results of testing the effect of California Bearing Ratio (CBR) according to АЅΤΜ D1883processing time on the strength of the base layer, when the prepared samples were processed and immersed in water for specific periods of time (4, 14, 30 days) the resistance ratio increased by (1.29%), (33.16%) upon penetration of 250 mm
Summary
Pavement design is a procedure for determining the most cost-effective combination of layer thicknesses and material types as for the pavement, consideration must be given to the characteristics of the underlying soil, the resulting traffic that is transported during the supposed service life of the road, and the affecting climatic conditions .]1[ This demonstrates the economic importance of road infrastructure, as well as the amount of money invested in road development and maintenance, and the necessary need for efficient pavement design and management methods. Roads are exposed to increasing pressure in their maintenance because they use recycled materials as alternative or secondary materials because they consume a large number of available materials (such as fine and coarse natural aggregates) in road construction These materials are usually used as well as other industrial byproducts, crushed concrete aggregate and old asphalt pavement as well as rubber tires and foundry sand as additives and stabilizers that are auxiliary to natural aggregates. The strength of aggregates depends largely on the cumulative effects of mechanical and physical properties of aggregated materials such as particle size distributions, geometry, shape, rough surface, size, sharp edges, and various minerals ]5[
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